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Parent Company Information - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 77,538	$ 77,841	$ 50,551	$ 58,673
Marketable equity securities	7,265	5,731
Taxes receivable	8,188	5,331
Other assets	56,504	56,141
Total assets	1,502,988	1,518,596	1,525,851
LIABILITIES
Junior subordinated debentures	10,310	10,310
Other liabilities	17,124	22,093
Total liabilities	1,297,041	1,325,794
SHAREHOLDERS' EQUITY
Common stock	6,883	6,872
Additional paid-in capital	62,132	61,793
Retained earnings	137,452	124,407
Accumulated other comprehensive loss, net of tax	(520)	(270)
Total liabilities and shareholders' equity	1,502,988	1,518,596
Northrim Bancorp, Inc.
ASSETS
Cash and cash equivalents	18,314	15,872	$ 11,963	$ 10,258
Marketable equity securities	7,265	5,731
Taxes receivable	6,914	992
Other assets	800	1,951
Total assets	216,885	204,149
LIABILITIES
Junior subordinated debentures	10,310	10,310
Other liabilities	628	1,037
Total liabilities	10,938	11,347
SHAREHOLDERS' EQUITY
Common stock	6,883	6,872
Additional paid-in capital	62,132	61,793
Retained earnings	137,452	124,322
Accumulated other comprehensive loss, net of tax	(520)	(185)
Total Northrim BanCorp, Inc. shareholders' equity	205,947	192,802
Total liabilities and shareholders' equity	216,885	204,149
Northrim Bancorp, Inc. | Northrim Bank
ASSETS
Investment in subsidiary	181,781	177,824
Northrim Bancorp, Inc. | Northrim Investment Services Company
ASSETS
Investment in subsidiary	1,501	1,469
Northrim Bancorp, Inc. | Northrim Statutory Trust 2
ASSETS
Investment in subsidiary	$ 310	$ 310

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